But be careful. In the given set of equation - 'z' is an 'unnecessary' variable. By introducing this type of variable, any set of equations can be "rendered" artificially to have infinite solutions. No practical (physical) situation can give rise to these equations. These are 'pathological' examples.
Before I answer this I would like to know the meaning of all of the variables, especially z. To be honest I have never a seen a problem like this. The 3 equations you listed, were they the original eqs or have they been reduced? That would be nice to know!
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